code: def h(self):
      self.h_call_count += 1
      return self.x * 2
  
file_path: chainer/tests/chainer_tests/utils_tests/test_cache.py
imports: import unittest
  import numpy
  import chainer
  from chainer import testing
  from chainer.utils import cache
label_desc: Use image node_id 2 for calling the MockDistribution obj's underlying member method code with example usage: obj.h() and returns: unknown